Typewriting machine



May 22, 1928.

, 1,671,053 B. c. STICKNEY TYPEWRITING MACHINE Filed March 1926 Patented May 22, 1928.

UNITED STATES PATENT;OFFICE.

BURNHAM c. STICKNEY, or PORTSMOUTH, New rmnrsnmnnssienon'ro UNDER- woon ELLIOTT FISHER COMPANY, or NEW YORK, N. Y., A CORPORATION or DELA- WARE.

"IYPEWRITING MACHINE.

' Original application filed July 14, 1922, Serial 110,574,866; Patent 1,583,263, dated May 4, 1926. Divided and this application filed March 30, 1926. Serial No. 98,454;

The presentinvention relates to platens for type-writing machines, and to processes for-.making the same.

An object of the invention is the produc- Y acter that, when the same is jacketed or faced with any one of various materials,

the printing will be of high quality.

The body is formed by winding a thin web of para rubber under high tension, and stretched to the desired thinness, around a large drum until the desired thickness of rubber cushioning material is attained; the

drum being preferably in the'nature of an anvil which opposes inertia to the typeblows, and consists of a heavily overweighted metal tube or cylinder. The rubber is covered with exterior wear-resisting material. Therubber and exterior material together form a tympan or surfacing for the drum, to soften and equalize the-typeblows. p

This application isa division of my application, Serial No. 574,866, filed July 14, 1922 (now Patent No. 1,583,263, dated May 4 1926 1 Othei features and advantages will hereinafter appear,

In the accompanying drawings,

Figure 1 is a View in cross-section through a platen in the process of formation; a web of rubber being wound under high tension to form a jacket on the drum. I

Figure 2 is a view in cross-section of the Figure 1 platen completed; a tubular'jacket or facing'of relatively hard rubber, celluloid, or other suitable material, being in place on the tensioned-rubber jacket.

Figure 3 is a view in cross-section of a form of the invention which a web of paper is wound over the rubber base on the drum or tubular core.

Fi ure 4 is a view in cross-section of'the base 12, around which it is tightlywound, layer upon layer, until the platen attains Figu ie 3 tube completed.

In'the embodimentof the invention shown is preferably a steel tube which may be about an'inch in diameter and of an inch 1n tlUCkHGSSi,

On the tube 10, a rubber web ll iswound,

underhigh tension, in layers to form a jacketI l2- (see Figure 2) of any desired thick ness. Ordinarily a thickness of from to of an inch for the jacket 12 will be sufiicient and satisfactory. In forming the jacket, the rubber webis led, untensioned as indicated at 13, from any suitable source, to tensioningrolls 14, from between which it emerges under tension as indicated at 11. \Vhen wound to desired thickness, the outer end of the tensioned web is cemented, or otherwisesecured, to the face of the jacket formed bythe web.

The jacket 12 having been ffornred 011 the drum, an outer jacket or wearing facing therefor is provided, consisting of a thin tubular shell '15 which may be of therelatively hard rubber usually constituting the platen jacket of a typewriting machine, or'

which may be of celluloid orother aterial suitable as a backing against which typewriting may be effected. The facing-tube 15 may be slipped on over the jacket 12,

"but shouldfit thesame snugly.

In a platen made as above described, the

i In Fi ures 3 and 4, the metal core 1O jacket or core 12 will be of greatelasticity has the acket 12 formed thereon'of superposed windings of highly-tensioned rubber in the manner described in connection with Figures 1 and 2. The outer jacket or facing 16 in this instance is, however, formed of.

roll, passes between'rolls 18 which tension the same, and thence passes to the jacket or the proper diameter. 7 At intervals a. little adhesive may be applied between the windings of paper to keep them tight; and finally the end of the paper is secured by adhesive to the Winding next below the same. The last few windings may, throughout the length of the same, be treated with an ad hesive, such as glue or Inucilage, or with shellac, or With a rubber or other cement, the more firmly to hold the same. Prefer ably the paper, either before or afterfor mation of the jacket 16, is stainedblack."

The highly-tensioned rubber surfacing 12 in the platen of Figure 4' acts, as in the 16 is itself highly elastic, and has other finest quality may be effected.

. Variations may be resorted to within the scope of the lnvention, and portions of the improvements may be used without others.

Having thus described my invention, I

claim: 7

A platen for a typewriting machine in eluding a rigid core, :a thin Web of pure rubber wound repeatedly around the core and in a state of high circumferential tension' and forming superposed layers there.

on, and a Web of thin tough paper wound repeatedly over the rubber layers and also in a condition of high circumferential tension 7 and providing afacing for the platen. 

